Nike's ultra-responsive cushioning makes running feel like flying. New Pegasus, new heights. This Peg 42 is paired with lightweight foam and a springy Air unit underfoot for bouncy support and all day comfort, whether you're lapping the track or the playground. And a mesh upper keeps your footwork light and breezy, helping you fly through recess, practice and waaaaay beyond. Forefoot Air Zoom Unit Our forefoot Air Zoom unit to delivers an energetic feel and comfort in every step. ReactX Foam Midsole ReactX foam is 13% more responsive than previous React technology. Breathable Upper Lightweight mesh is softer and more breathable than earlier versions, helping your feet stay comfortable. High-Abrasion Rubber Outsole Lighter than previous models, an updated Waffle outsole delivers traction and flexibility with high-abrasion rubber and flex grooves. Wide toe box We updated the fit to give you a little extra room at the toes and forefoot compared to the 41. Targeted forefoot cushioning for improved toe-off compared to the Pegasus 41 Updated silhouette increases the upward curve under the toe box for greater toe spring than previous model